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Investments (Schedule of Net Realized and Unrealized Gains on Investments and Net Other-Than-Temporary Impairments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Gain (Loss) on Investments [Line Items]        
Net realized and unrealized gains on investments $ (31,097) $ 28,472 $ 10,958 $ (26,788)
Fixed maturity investments
        
Gain (Loss) on Investments [Line Items]        
Gross realized gains 7,962 8,813 33,595 60,437
Gross realized losses (2,720) (22,241) (10,871) (41,396)
Net realized gains on fixed maturity investments 5,242 (13,428) 22,724 19,041
Net unrealized gains (losses) on investments trading (36,600) 33,405 21,200 (85,338)
Derivatives
        
Gain (Loss) on Investments [Line Items]        
Net realized and unrealized (losses) gains on investments-related derivatives (1,868) 3,557 (19,651) 24,488
Equity investments
        
Gain (Loss) on Investments [Line Items]        
Net unrealized gains (losses) on investments trading (1,394) 4,378 (21,893) (3,174)
Net realized gains on equity investments trading $ 3,523 $ 560 $ 8,578 $ 18,195